class Parent:
    def __init__(self) -> None:
        self.num = 100
        print("Parent __init__")

class Student():
    def __init__(self) -> None:
        self.num = 300
        
        print("Student __init__")

class Son(Parent,Student):
    def __init__(self) -> None:
        super().__init__()
        self.num = 200
        print("Son __init__")

x = Son()
